Extract Machine from ethcore (#10949)

* Add client-traits crate
Move the BlockInfo trait to new crate

* New crate `machine`
Contains code extracted from ethcore that defines `Machine`, `Externalities` and other execution related code.

* Use new machine and client-traits crates in ethcore

* Use new crates machine and client-traits instead of ethcore where appropriate

* Fix tests

* Don't re-export so many types from ethcore::client

* Fixing more fallout from removing re-export

* fix test

* More fallout from not re-exporting types

* Add some docs

* cleanup

* import the macro edition style

* Tweak docs

* Add missing import

* remove unused ethabi_derive imports

* Use latest ethabi-contract

parity/configuration.rs

@@ -1194,11 +1194,12 @@ mod tests {
 	use std::str::FromStr;
 
 	use tempdir::TempDir;
-	use ethcore::client::{VMType, BlockId};
+	use ethcore::client::VMType;
 	use ethcore::miner::MinerOptions;
 	use miner::pool::PrioritizationStrategy;
 	use parity_rpc::NetworkSettings;
 	use updater::{UpdatePolicy, UpdateFilter, ReleaseTrack};
+	use types::ids::BlockId;
 
 	use account::{AccountCmd, NewAccount, ImportAccounts, ListAccounts};
 	use blockchain::{BlockchainCmd, ImportBlockchain, ExportBlockchain, DataFormat, ExportState};